dev-haskell/contravariant: increase lower void bump up to 0.7.1

Fixes build failure on ghc-7.10.1 with void-0.6.

Package-Manager: portage-2.2.28

dev-haskell/contravariant/contravariant-1.3.3.ebuild

@@ -20,7 +20,7 @@ IUSE="+semigroups +statevar +tagged"
 
 RDEPEND=">=dev-haskell/transformers-0.2:=[profile?] <dev-haskell/transformers-0.5:=[profile?]
  >=dev-haskell/transformers-compat-0.3:=[profile?] <dev-haskell/transformers-compat-1:=[profile?]
- >=dev-haskell/void-0.6:=[profile?] <dev-haskell/void-1:=[profile?]
+ >=dev-haskell/void-0.7.1:=[profile?] <dev-haskell/void-1:=[profile?]
  >=dev-lang/ghc-7.4.1:=
  semigroups? ( >=dev-haskell/semigroups-0.15.2:=[profile?] <dev-haskell/semigroups-1:=[profile?] )
  statevar? ( >=dev-haskell/statevar-1.1:=[profile?] <dev-haskell/statevar-1.2:=[profile?] )